Basic
- What's New in Vyper 0.4
- Hello World
- Data Types - Values
- Data Types - References
- Dynamic Arrays
- Constructor
- Private and Public State Variables
- Constants
- Immutable
- Function
- Internal and External Functions
- View and Pure Functions
- If Else
- For Loop
- Error
- Event
- Payable
- Default Function
- Send Ether
- Interface
- Raw Call
- Delegate Call
- Hash Function
- Verify Signature
- Re-entrancy Lock
- Create New Contract
- Self Destruct
- Imports
- Modules
- Unsafe Math
- Debug with Print
View and Pure Functions
For the most up to date version of this content, please see View and Pure Functions (Code Example) on Cyfrin.io
Both pure and view functions are read only function, they cannot write anything to the blockchain.
pure functions do not read any state or global variables
view functions can read state variables, global variables and call internal functions.
# pragma version ^0.4.0
num: public(uint256)
# Pure functions does not read any state or global variables
@external
@pure
def pureFunc(x: uint256) -> uint256:
return x
# View functions might read state or global state, or call an internal function
@external
@view
def viewFunc(x: uint256) -> bool:
return x > self.num
@external
@pure
def sum(x: uint256, y: uint256, z: uint256) -> uint256:
return x + y + z
@external
@view
def addNum(x: uint256) -> uint256:
return x + self.num
Try on Smart Contract Engineer
